ARToolKit for Linux is a applications that involve the overlay of virtual imagery on the real world. ARToolKit for Linuxt is a software library for building Augmented Reality (AR) applications. ARToolKit for Linux uses computer vision algorithms to solve this problem. The ARToolKit video tracking libraries calculate the real camera position and orientation relative to physical markers in real time. This enables the easy development of a wide range of Augmented Reality applications. ARToolKit for Linux provides Single camera position and orientation tracking, Tracking code that uses simple black squares, The ability to use any square marker patterns, and Easy camera calibration code.